(19)

(11)

EP 2 670 814 A2

(12)

(43) Date of publication: 11.12.2013 Bulletin 2013/50 (21) Application number: 12704979.9 (22) Date of filing: 31.01.2012

(51) International Patent Classification (IPC):  C09K 8/12(2006.01) B01F 17/00(2006.01) C09K 8/68(2006.01) (86) International application number: PCT/US2012/023323 (87) International publication number: WO 2012/106336 (09.08.2012 Gazette 2012/32)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 02.02.2011 US 201113019375 (71) Applicant: Baker Hughes Incorporated Houston, TX 77019-2118 (US)	(72) Inventors: GUPTA, Satyanarayana, D.V. The Woodlands, TX 77382 (US) CHETTY, Madhukar Houston, TX 77059 (US) CARMAN, Paul, Scott Spring, TX 77379 (US) (74) Representative: Hoffmann, Benjamin  Dehns St. Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)